It takes about two hours for the cervical canal to disappear completely, but the time for the disappearance of the cervical canal is related to the size of the fetus, labor force, birth canal, fetal pelvic situation and maternal psychological factors, the specific disappearance time varies from person to person, compared to menstruating mothers, first-time mothers The disappearance of the cervical canal takes longer in first-time mothers than in menstruating mothers. In primiparous women, the cervical canal usually disappears before delivery, followed by dilatation of the uterine orifice, which is relatively tighter and slower due to the first birth. In contrast, menstruating women usually show the disappearance of the cervical canal at the same time as the dilatation of the uterine orifice, which will be looser and the disappearance of the cervical canal will be relatively fast. During the disappearance of the cervical canal, it is recommended that the mother should relax and take sufficient rest during the interval between contractions to preserve her strength and prepare for the second stage of labor.